Any time one avoids something so deftly, or shows such otherworldly skill, when accomplishing any task, that it literally makes everyone around hold their breath, or something to that effect... that is a Matrix Move. This can describe almost anything, so long as it is done in an extraordinary way.
Matrix Moves almost always lead to an Epic Win, and be a result of skill, talent, or even just sheer blind, dumb, stupid luck.

"Did you see the way D took the Platoon Sergeant down, in hand-to-hand training? He totally used a Matrix Move!"